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Saturday, 29 March 2014

Servlets : ServletLifeCycle - Example


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 ServletInterface Project Dir Structure
ServletLifeCycle - Example

 ServletsLifeCycle.java
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import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

// Extend HttpServlet class
public class ServletsLifeCycle extends HttpServlet
{

  private static final long serialVersionUID = 1L;
  private int i;

  public void init() throws ServletException
  {
    System.out.println("------------------------------------------------------");
    System.out.println(" Init method is called ");
    System.out.println("------------------------------------------------------");
  }

  public void service( HttpServletRequest request, HttpServletResponse response ) throws ServletException,
                  IOException
  {
    ++i;
    System.out.println(" service method is called "+i+ " time");
    // Set response content type
    response.setContentType("text/html");

    // Actual logic goes here.
    PrintWriter out = response.getWriter();
    out.println("<h1>" + " service method is called "+i+ " time" + "</h1>");
  }

  public void destroy()
  {
    System.out.println("------------------------------------------------------");
    System.out.println(" destroy method is called ");
    System.out.println("------------------------------------------------------");
  }
}

web.xml
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<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0"
  metadata-complete="true">

    <display-name>ServletsLifeCycle Application</display-name>
    <description>
        This is a simple web application with a source code organization
        based on the recommendations of the Application Developer's Guide.
    </description>

     <servlet>
        <servlet-name>ServletsLifeCycle</servlet-name>
        <servlet-class>ServletsLifeCycle</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>ServletsLifeCycle</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>
    
</web-app>


index.html
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<!DOCTYPE HTML><html lang="en"><head>
<meta charset="UTF-8">
<title>ServletsLifeCycle</title>
</head>
<body>
<p>
<h3>ServletsLifeCycle</H3>
<p></p>
<ul>
<li><a href="hello">ServletsLifeCycle Test</a></li>

</ul>
</body></html>

Environment Used

JDK version :1.6.0_30
Tomcat version : 7.0.50 

To Download HelloworldApp Project Click the below link

https://sites.google.com/site/javaee4321/servlets/ServletsLifeCycleApp.zip?attredirects=0&d=1

See also:

  • Servlets Tutorial
  • All Design Patterns Links
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